examples improvement - added some README.md stubs

examples/multisite-custom-subfolders/README.md

@@ -0,0 +1,11 @@
+# Multisite with custom subfolders
+
+This is a basic example for hosting multiple web services with custom subfolders.
+
+## Architecture
+
+<img src="https://github.com/bunkerity/bunkerized-nginx/blob/dev/examples/multisite-custom-subfolders/architecture.png?raw=true" />
+
+## Docker
+
+See [docker-compose.yml](https://github.com/bunkerity/bunkerized-nginx/blob/master/examples/multisite-custom-subfolders/docker-compose.yml).